Negative electrode for spark plug



FIG. 1 is a perspective view of a negative electrode according to the invention, the negative electrode is shown and attached to the base of a spark plug which is indicated by the broken lines and which forms no part of the invention;

FIG. 2 is a side elevational view of the negative electrode of FIG. 1;

FIG. 3 is a front elevation view of the negative electrode of FIG. 1;

FIG. 4 is a rear elevational view of the negative electrode of FIG. 1;

FIG. 5 is a top plan view of the negative electrode of FIG. 1; and,

FIG. 6 is a bottom plan view of the negative electrode of FIG. 1. 

The ornamental design for a negative electrode for spark plug, as shown and described. 